<template>
  <div>
    <!-- 面包屑导航区  -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 警告文本区 -->
      <el-alert
        title="注意：只允许选择最后级别的分类设置相关参数！"
        type="warning"
        :closable="false"
        show-icon
      ></el-alert>

      <!-- 选择商品分类区 -->
      <el-row class="cat_opt">
        <el-col>
          <!-- 选择商品分类的级联选择框 -->
          <span>选择商品分类：</span>
          <el-cascader
            v-model="selectdCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleCasClick()"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tabs 页签区域 -->
      <el-tabs class="cat_opt" v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加动态参数</el-button
          >
          <!-- 动态参数的表格 -->
          <el-table :data="manyTableData" style="width: 100%" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <!-- 循环渲染Tag标签 -->
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 添加输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="序号"> </el-table-column>
            <el-table-column label="参数名称" prop="attr_name">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="delParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加静态属性</el-button
          >
          <!-- 静态参数的表格 -->
          <el-table :data="onlyTableData" style="width: 100%" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 添加输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="序号"> </el-table-column>
            <el-table-column label="属性名称" prop="attr_name">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="delParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="40%"
      @close="addDialogClosed"
    >
      <!-- 添加参数表单 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="subParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="40%"
      @close="addDialogClosed"
    >
      <!-- 添加参数表单 -->
      <el-form
        :model="editForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="subEditParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 保存商品分类数据
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //存储选择分类id
      selectdCateKeys: [],
      //被激活的页签名称
      activeName: "many",
      //动态参数数据
      manyTableData: [],
      //   静态属性数据
      onlyTableData: [],
      //控制添加数据的对话框显示与隐藏
      addDialogVisible: false,
      //添加参数的表单数据的对象
      addForm: {
        attr_name: "",
      },
      //添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      //控制编辑参数的对话框显示与隐藏
      editDialogVisible: false,
      //编辑参数数据对象
      editForm: {
        attr_name: "",
        activeName: "",
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有商品数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败！");
      }
      this.cateList = res.data;
    },
    //点击级联选择框是触发事件，获取参数列表
    handleCasClick() {
      this.getParamsData();
    },
    //Tab页签点击事件的处理
    handleTabClick() {
      this.getParamsData();
    },
    //获取参数的列表数据
    async getParamsData() {
      //根据分类的id和所处的面板获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      );
      //   console.log(res);
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数失败！");
      }
      //获取每一个参数并以空格的形式返回为一个新的数组
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        // 控制Tag中新增参数和属性的输入文本框的显示和隐藏
        item.inputVisible = false;
        //Tag中新增的内容
        item.inputValue = "";
      });

      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    //监听添加参数表单对话框的关闭事件，关闭后重置表单
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    //将添加的参数提交到服务器
    subParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          { attr_name: this.addForm.attr_name, attr_sel: this.activeName }
        );
        if (res.meta.status !== 201) {
          return this.$message.error("获取参数失败！");
        }
        this.$message.success("添加参数成功！");
        this.getParamsData();
        this.addDialogVisible = false;
      });
    },
    //编辑参数对话框
    async showEditDialog(attr_id) {
      //查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数信息失败！");
      }
      this.editForm = res.data;
      this.editDialogVisible = true;
    },

    //提交编辑后的参数
    subEditParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("编辑参数失败！");
        }
        this.getParamsData();
        this.editDialogVisible = false;
        this.$message.success("编辑成功！");
      });
    },
    //删除当前参数
    async delParams(attr_id) {
      //弹框询问用户是否删除
      const confirmResult = await this.$confirm(
        "此操作将永久删除该分类, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      //如果用户确认删除，则返回字符串confirm
      //如果用户取消删除，着返回字符串cancel
      if (confirmResult == "cancel") {
        return this.$message.info("已经取消删除！");
      }
      //获取数据
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败！");
      }
      //刷新参数列表
      this.getParamsData();
      //提示
      this.$message.success("删除参数成功！");
    },
    //文本框失去焦点或触发回车键就执行该函数
    async handleInputConfirm(row) {
      //判断用输入的数据是否有效
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      //如果用户输入合法的内容，将内容作为新增的参数添加
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      //发起请求将参数和属性数组重新保存到数据库中
      this.saveAttrValus(row);
    },
    //新增或删除 new tag 时数据的请求方式
    async saveAttrValus(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: this.activeName,
          attr_vals: row.attr_vals.join(" "),
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("操作参数失败！");
      }
      this.$message.success("操作参数成功！");
    },
    //当点击 + New Tag 按钮时触发该事件，隐藏按钮显示输入文本框
    showInput(row) {
      row.inputVisible = true;
      //让文本框自动获得焦点
      //$nextTick:当页面上的元素被重新渲染后，才会指定回调函数中的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    //删除 new tag 标签
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      //请求数据，将操作后的数据报讯到数据库
      this.saveAttrValus(row);
    },
  },
  computed: {
    //如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectdCateKeys.length == 0) {
        return true;
      }
      return false;
    },

    //当前选中的分类id
    cateId() {
      if (this.selectdCateKeys.length === 3) {
        return this.selectdCateKeys[2];
      } else if (this.selectdCateKeys.length === 2) {
        return this.selectdCateKeys[1];
      } else {
        return null;
      }
    },
    // 动态计算标题文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性";
    },
  },
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
  text-align: left;
}
.el-tag {
  margin: 8px;
}
.input-new-tag {
  width: 100px;
}
</style>
